diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2013-10-17 16:33:43 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2013-10-17 16:33:43 -0300 |
| commit | 97a07f10c38064dea492794c99445f6260afcdc1 (patch) | |
| tree | baa4b7832bae42e80cb0f27bde490c73875f1a95 /tools | |
| parent | 6ef068cb8e77784431b6c80adc49d0b0a6a5df66 (diff) | |
perf tools: Introduce filename__read_int helper
Just opens a file and calls atoi() in at most its first 64 bytes.
To read things like /proc/sys/kernel/perf_event_paranoid.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-669q04c5tou5pnt8jtiz6y2r@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/util/util.c | 17 | ||||
| -rw-r--r-- | tools/perf/util/util.h | 2 |
2 files changed, 19 insertions, 0 deletions
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c index 8dc8cf39f4ed..c25e57b3acb2 100644 --- a/tools/perf/util/util.c +++ b/tools/perf/util/util.c @@ -394,3 +394,20 @@ unsigned long parse_tag_value(const char *str, struct parse_tag *tags) return (unsigned long) -1; } + +int filename__read_int(const char *filename, int *value) +{ + char line[64]; + int fd = open(filename, O_RDONLY), err = -1; + + if (fd < 0) + return -1; + + if (read(fd, line, sizeof(line)) > 0) { + *value = atoi(line); + err = 0; + } + + close(fd); + return err; +} diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h index 42dfba70fbfc..c8f362daba87 100644 --- a/tools/perf/util/util.h +++ b/tools/perf/util/util.h @@ -305,4 +305,6 @@ struct dso; char *get_srcline(struct dso *dso, unsigned long addr); void free_srcline(char *srcline); + +int filename__read_int(const char *filename, int *value); #endif /* GIT_COMPAT_UTIL_H */ |